A toner sensor error is displayed when the machine is no longer able to detect the toner cartridge / drum unit, or is no longer able to determine how much toner is left in the units.

How to clear the Toner Sensor Errors

If your printer displays a toner sensor error please power off the printer and check the following:

Check that all the blue toner levers are pushed firmly towards the back of the machine

Check if the sensors need to be cleaned. The sensor is located behind a plastic cover on the side of the drum (see below). Remove the plastic cover and give the silver arm a clean with something small and soft (lint free), any toner that has built up on the sensor will be a very fine powder and should be easy to remove.

Sensor with cover on Sensor with cover off

Check if the sensor lever on TS1 has been pushed up. Once you have cleaned the arm, check that the sensor lever has been pushed up (see Correct Position below).

Correct Position Incorrect Position

If it is incorrect it can sometimes result in the blanking disc not being pulled out of the way, this results in the sensor on the machine not picking up the sensor on the drum. Pushing the disc up will resolve the problem. The disc will not fall back down again, providing that the blue Toner Lever is pushed firmly to the back of the machine.

After all these checks are completed place the cover back on the side of the drum. It should go back on the same way it came off. If you are unable to fit the plastic cover on the drum, you can leave it off as it will not stop the drum from printing.

Install the drum and toner in the machine and switch on, if you still have an error message please contact your local OKI Support Representative for further assistance.